source: src/ResolvExpr/typeops.h @ 59a75cb

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// typeops.h --
//
// Author           : Richard C. Bilson
// Created On       : Sun May 17 07:28:22 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Sat Jul 22 09:36:18 2017
// Update Count     : 3
//

#pragma once

#include "SynTree/SynTree.h"
#include "SynTree/Type.h"
#include "SymTab/Indexer.h"
#include "Cost.h"
#include "TypeEnvironment.h"

namespace ResolvExpr {
        // combos: takes a list of sets and returns a set of lists representing every possible way of forming a list by
        // picking one element out of each set
        template< typename InputIterator, typename OutputIterator >
        void combos( InputIterator begin, InputIterator end, OutputIterator out ) {
                typedef typename InputIterator::value_type SetType;
                typedef typename std::list< typename SetType::value_type > ListType;

                if ( begin == end )     {
                        *out++ = ListType();
                        return;
                } // if

                InputIterator current = begin;
                begin++;

                std::list< ListType > recursiveResult;
                combos( begin, end, back_inserter( recursiveResult ) );

                for ( typename std::list< ListType >::const_iterator i = recursiveResult.begin(); i != recursiveResult.end(); ++i ) {
                        for ( typename ListType::const_iterator j = current->begin(); j != current->end(); ++j ) {
                                ListType result;
                                std::back_insert_iterator< ListType > inserter = back_inserter( result );
                                *inserter++ = *j;
                                std::copy( i->begin(), i->end(), inserter );
                                *out++ = result;
                        } // for
                } // for
        }

        // in AdjustExprType.cc
        /// Replaces array types with the equivalent pointer, and function types with a pointer-to-function
        void adjustExprType( Type *&type, const TypeEnvironment &env, const SymTab::Indexer &indexer );

        template< typename ForwardIterator >
        void adjustExprTypeList( ForwardIterator begin, ForwardIterator end, const TypeEnvironment &env, const SymTab::Indexer &indexer ) {
                while ( begin != end ) {
                        adjustExprType( *begin++, env, indexer );
                } // while
        }

        // in CastCost.cc
        Cost castCost( Type *src, Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env );

        template< typename SrcIterator, typename DestIterator >
        Cost castCostList( SrcIterator srcBegin, SrcIterator srcEnd, DestIterator destBegin, DestIterator destEnd, const SymTab::Indexer &indexer, const TypeEnvironment &env ) {
                Cost ret;
                if ( destBegin == destEnd ) {
                        if ( srcBegin == srcEnd ) {
                                return Cost::zero;
                        } else {
                                return Cost( 0, 0, 1 );
                        } // if
                } // if
                while ( srcBegin != srcEnd && destBegin != destEnd ) {
                        Cost thisCost = castCost( *srcBegin++, *destBegin++, indexer, env );
                        if ( thisCost == Cost::infinity ) {
                                return Cost::infinity;
                        } // if
                        ret += thisCost;
                } // while
                if ( srcBegin == srcEnd && destBegin == destEnd ) {
                        return ret;
                } else {
                        return Cost::infinity;
                } // if
        }

        // in ConversionCost.cc
        Cost conversionCost( Type *src, Type *dest, const SymTab::Indexer &indexer, const TypeEnvironment &env );

        template< typename SrcIterator, typename DestIterator >
        Cost conversionCostList( SrcIterator srcBegin, SrcIterator srcEnd, DestIterator destBegin, DestIterator destEnd, const SymTab::Indexer &indexer, const TypeEnvironment &env ) {
                Cost ret;
                while ( srcBegin != srcEnd && destBegin != destEnd ) {
                        Cost thisCost = conversionCost( *srcBegin++, *destBegin++, indexer, env );
                        if ( thisCost == Cost::infinity ) {
                                return Cost::infinity;
                        } // if
                        ret += thisCost;
                } // while
                if ( srcBegin == srcEnd && destBegin == destEnd ) {
                        return ret;
                } else {
                        return Cost::infinity;
                } // if
        }

        // in PtrsAssignable.cc
        int ptrsAssignable( Type *src, Type *dest, const TypeEnvironment &env );

        // in PtrsCastable.cc
        int ptrsCastable( Type *src, Type *dest, const TypeEnvironment &env, const SymTab::Indexer &indexer );

        // in Unify.cc
        bool isFtype( Type *type );
        bool typesCompatible( Type *, Type *, const SymTab::Indexer &indexer, const TypeEnvironment &env );
        bool typesCompatibleIgnoreQualifiers( Type *, Type *, const SymTab::Indexer &indexer, const TypeEnvironment &env );

        inline bool typesCompatible( Type *t1, Type *t2, const SymTab::Indexer &indexer ) {
                TypeEnvironment env;
                return typesCompatible( t1, t2, indexer, env );
        }

        inline bool typesCompatibleIgnoreQualifiers( Type *t1, Type *t2, const SymTab::Indexer &indexer ) {
                TypeEnvironment env;
                return typesCompatibleIgnoreQualifiers( t1, t2, indexer, env );
        }

        /// creates the type represented by the list of returnVals in a FunctionType. The caller owns the return value.
        Type * extractResultType( FunctionType * functionType );

        // in CommonType.cc
        Type *commonType( Type *type1, Type *type2, bool widenFirst, bool widenSecond, const SymTab::Indexer &indexer, TypeEnvironment &env, const OpenVarSet &openVars );

        // in PolyCost.cc
        int polyCost( Type *type, const TypeEnvironment &env, const SymTab::Indexer &indexer );

        // in Occurs.cc
        bool occurs( Type *type, std::string varName, const TypeEnvironment &env );

        // flatten tuple type into list of types
        template< typename OutputIterator >
        void flatten( Type * type, OutputIterator out ) {
                if ( TupleType * tupleType = dynamic_cast< TupleType * >( type ) ) {
                        for ( Type * t : tupleType->get_types() ) {
                                flatten( t, out );
                        }
                } else {
                        *out++ = type->clone();
                }
        }
} // namespace ResolvExpr

// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //